varnish cache hack to purge all request url which are originated due to url's

purge.vcl

        if (req.method == "PURGE") {
                if (!client.ip ~ purge) {
                        return(synth(405,"Not allowed."));
                }

                # Throw a synthetic page so the
                # request won't go to the backend.
                 if (req.url ~ "(\/.*\?$)"){
                 ban("req.http.host == " + req.http.host + " && req.url ~ " + req.url + "\?(.*)?$");
                 }
                 if (req.url ~ "(\/search\/smartphone\/.*?$)"){
                 set req.url = regsuball(req.url, "[\?]+$", "");
                 ban("req.http.host == " + req.http.host + " && req.url ~ " + req.url + ".*?$");
                 }
                 return(synth(200,"Purged"));
        }